Air conditioning system and control method thereof

Abstract

The invention discloses an air conditioning system and a control method thereof. The air conditioning system comprises a preheating section, a surface air cooler section, a steam heating section, a first mixer, a condensate pump, two steam valves, an outdoor temperature sensor and a control module, high-temperature condensate water generated by the preheating section and the steam heating section is mixed in the first mixer to obtain high-temperature mixed condensate water, the high-temperature mixed condensate water is input into the surface air cooler section, and the surface air cooler section is connected with the first mixer. The condensate pump is used for adjusting the flow of high-temperature mixed condensate water entering the surface air cooler section, and the two steam valves are used for controlling the flow of high-temperature steam entering the preheating section and the steam heating section respectively. Auxiliary heating of to-be-heated air is achieved through the surface air cooler section, the use amount of high-temperature steam in the subsequent steam heating section is effectively reduced, and energy consumption is reduced. Meanwhile, the harm caused by directly discharging high-temperature condensate water into a sewage system is avoided, the problem that the surface air cooler section is idle in winter is solved, and the utilization rate of equipment is increased.

Description

Technical Field

[0001] This invention relates to the field of air conditioning technology, and in particular to an air conditioning system and its control method. Background Technology

[0002] In cold regions like Xinjiang, where outdoor temperatures are extremely low in winter, central air conditioning units often need to fully heat both fresh and return air before supplying air to meet process requirements. Currently, the common heating method involves setting up preheating and steam heating sections within the unit, using dry steam for heating. This process generates a large amount of condensate at temperatures as high as 80-95°C. For condensate that meets quality standards, recycling is usually employed; however, due to the long distances of the recycling pipelines, heat loss during transportation is significant, reaching 40-60%, resulting in considerable energy waste. For condensate that does not meet quality standards, it is typically discharged directly into the wastewater system.

[0003] The existing treatment methods described above have significant drawbacks: First, they result in severe energy waste. The waste heat contained in the high-temperature condensate is not effectively utilized, and long-distance recovery leads to substantial heat loss. Furthermore, the surface coolers within the unit are often idle in winter, resulting in low equipment utilization and limited functionality. Second, they have significant environmental impacts. Directly discharged high-temperature condensate can cause temperature shocks to the wastewater biological treatment system downstream of the sewage pipeline, damaging microbial activity and affecting treatment efficiency. High-temperature wastewater also constitutes thermal pollution, failing to meet environmental emission requirements. Finally, the overall system operating efficiency is low. The heating load is concentrated in the steam heating section, leading to consistently high energy consumption. Moreover, there is a lack of intelligent control methods based on changes in outdoor temperature, making the operation inflexible and uneconomical. Summary of the Invention

[0004] This invention provides an air conditioning system and its control method, which realizes heat exchange between high-temperature condensate and air to be heated in the surface cooler section, avoids heat waste, realizes auxiliary heating of air to be heated, solves the problem of the surface cooler section being idle in winter, and improves the utilization rate of the equipment.

[0005] In a first aspect, the present invention provides an air conditioning system, comprising: a preheating section, a surface cooler section, a steam heating section, a first mixer, a condensate pump, two steam valves, an outdoor temperature sensor, and a control module; wherein the condensate pump, the two steam valves, and the outdoor temperature sensor are respectively connected to the control module;

[0006] The preheating section, the surface cooler section, and the steam heating section each include an air inlet and an air outlet. The air inlets and air outlets of the preheating section, the surface cooler section, and the steam heating section are connected in sequence. The air inlet of the preheating section is used to receive air to be heated, and the air outlet of the steam heating section is used to output heated air.

[0007] The preheating section further includes a first steam inlet and a first condensate outlet. The first steam inlet is used to receive high-temperature steam to heat the air to be heated, and the first condensate outlet is used to output the high-temperature condensate generated by the preheating section.

[0008] The steam heating section further includes a second steam inlet and a second condensate outlet. The second steam inlet is used to receive high-temperature steam to heat the air to be heated output from the surface cooler section, and the second condensate outlet is used to output the high-temperature condensate generated by the steam heating section.

[0009] The first condensate outlet is connected to the first inlet of the first mixer, and the second condensate outlet is connected to the second inlet of the first mixer, so as to form high-temperature mixed condensate at the outlet of the first mixer;

[0010] The surface cooler section includes a high-temperature condensate inlet and a low-temperature condensate outlet; the high-temperature condensate inlet is connected to the outlet of the first mixer and is used to receive the high-temperature mixed condensate; the low-temperature condensate outlet is used to output the low-temperature condensate after heat exchange with the air to be heated;

[0011] The condensate pump is located between the high-temperature condensate inlet and the outlet of the first mixer;

[0012] The control module is used to control the condensate pump to adjust the flow rate of the high-temperature mixed condensate according to the heat load demand of the air to be heated;

[0013] The outdoor temperature sensor is used to detect the outdoor temperature and obtain the outdoor temperature value;

[0014] The two steam valves are respectively connected to the first steam inlet of the preheating section and the second steam inlet of the steam heating section;

[0015] The control module is used to acquire the outdoor temperature value and, based on the outdoor temperature value, control the two steam valves to adjust the flow rate of the high-temperature steam input to the preheating section and the steam heating section, respectively.

[0016] Optionally, the control module is used for:

[0017] When the outdoor temperature T is less than the first outdoor temperature threshold, the opening degree x of the two steam valves is adjusted according to the formula x=70+min(30, (-10-T)×3);

[0018] When the outdoor temperature value T is greater than or equal to the first outdoor temperature threshold and less than the second outdoor temperature threshold, the opening degree x of the two steam valves is adjusted according to the formula x=30+(0-T)×4;

[0019] When the outdoor temperature value T is greater than or equal to the second outdoor temperature threshold and less than the third outdoor temperature threshold, the opening degree x of the two steam valves is adjusted according to the formula x=max(0, (30-T)×3);

[0020] When the outdoor temperature value T is greater than or equal to the third outdoor temperature threshold, the opening degree x of the two steam valves is set to 0.

[0021] Optionally, it further includes a first temperature sensor, a first flow valve, and a second flow valve; the first temperature sensor, the first flow valve, and the second flow valve are respectively connected to the control module;

[0022] The first temperature sensor is connected to the outlet of the first mixer to detect the temperature of the high-temperature mixed condensate and obtain the temperature value of the high-temperature mixed condensate.

[0023] The first flow valve is located between the first condensate outlet of the preheating section and the first inlet of the first mixer; the second flow valve is located between the second condensate outlet of the steam heating section and the second inlet of the first mixer.

[0024] The control module is used to acquire the temperature value of the high-temperature mixed condensate, and when the temperature value of the high-temperature mixed condensate exceeds the preset condensation temperature range, control the first flow valve to adjust the flow rate of the high-temperature condensate generated in the preheating section, and control the second flow valve to adjust the flow rate of the high-temperature condensate generated in the steam heating section.

[0025] Optionally, it also includes a flow meter; the flow meter is connected to the control module;

[0026] The flow meter is connected to the high-temperature condensate inlet and is used to detect the current flow rate of the high-temperature mixed condensate.

[0027] The control module is used for:

[0028] Obtain the current flow rate of the high-temperature mixed condensate;

[0029] Obtain the current rotational speed of the condensate pump;

[0030] Calculate the target flow rate of the high-temperature mixed condensate based on the heat load requirement of the air to be heated;

[0031] The latest speed of the condensate pump is controlled based on the target flow rate, the current flow rate, and the current speed.

[0032] Optionally, it also includes a water quality testing device, a second temperature sensor, a first bypass valve, and a second mixer; the second temperature sensor and the first bypass valve are respectively connected to the control module;

[0033] The water quality testing device includes a low-temperature condensate inlet, a low-temperature drain outlet, and a low-temperature return water outlet; the low-temperature condensate inlet of the water quality testing device is connected to the low-temperature condensate outlet of the surface cooler section, and is used to test the water quality of the low-temperature condensate.

[0034] The inlet of the first bypass valve is connected to the low-temperature return water outlet of the water quality detection device, and the outlet of the first bypass valve is connected to the second inlet of the second mixer.

[0035] The first inlet of the second mixer is connected to the second condensate outlet of the steam heating section; the outlet of the second mixer is connected to the second inlet of the first mixer.

[0036] When the water quality of the low-temperature condensate is substandard, the low-temperature condensate outlet of the water quality testing device will discharge the low-temperature condensate.

[0037] When the water quality of the low-temperature condensate is qualified, the low-temperature return water outlet of the water quality testing device inputs the low-temperature condensate into the inlet of the first bypass valve.

[0038] The second temperature sensor is connected to the second condensate outlet of the steam heating section and is used to detect the temperature of the high-temperature condensate generated by the steam heating section to obtain the condensate temperature value; the control module is used to obtain the condensate temperature value and, when the condensate temperature value is higher than the first condensate temperature threshold, control the first bypass valve to open so that the high-temperature condensate generated by the steam heating section mixes with the low-temperature condensate.

[0039] Optionally, it also includes a third temperature sensor and a temperature regulating valve; the third temperature sensor and the temperature regulating valve are respectively connected to the control module;

[0040] The third temperature sensor is connected to the high-temperature condensate inlet of the surface cooler section and is used to detect the temperature of the high-temperature mixed condensate to obtain the condensate inlet temperature value.

[0041] The inlet of the temperature regulating valve is connected to the low-temperature return water outlet of the water quality detection device, and the outlet of the temperature regulating valve is connected to the high-temperature condensate inlet of the surface cooler section.

[0042] The control module is used to acquire the condensate inlet temperature value and control the opening of the temperature regulating valve according to the condensate inlet temperature value, so that the low-temperature condensate and the high-temperature mixed condensate are mixed.

[0043] Optionally, it also includes a fourth temperature sensor and a fifth temperature sensor; the fourth temperature sensor and the fifth temperature sensor are respectively connected to the control module;

[0044] The fourth temperature sensor is connected to the low-temperature condensate outlet of the surface cooler section and is used to detect the low-temperature condensate temperature at the low-temperature condensate outlet and obtain the low-temperature condensate temperature value.

[0045] The fifth temperature sensor is located on the surface of the surface cooler section and is used to detect the temperature of the surface of the surface cooler section and obtain the surface temperature value.

[0046] The control module is used to acquire the low-temperature condensate temperature value and the surface temperature value, and when the low-temperature condensate temperature value is less than the first antifreeze temperature threshold or the surface temperature value is less than the second antifreeze temperature threshold, it controls the condensate pump to increase its speed and controls the first bypass valve and the temperature regulating valve to close.

[0047] Optionally, it also includes a coarse filter, a first pressure sensor, a second pressure sensor, and a second bypass valve; the first pressure sensor, the second pressure sensor, and the second bypass valve are respectively connected to the control module;

[0048] The coarse filter is located between the outlet of the first mixer and the inlet of the high-temperature condensate in the surface cooler section, and is used to filter the high-temperature mixed condensate.

[0049] The first pressure sensor is connected to the inlet of the coarse filter and is used to detect the water flow pressure at the inlet of the coarse filter to obtain a first water flow pressure value.

[0050] The second pressure sensor is connected to the outlet of the coarse filter and is used to detect the water flow pressure at the outlet of the coarse filter to obtain a second water flow pressure value.

[0051] The second bypass valve is located between the outlet of the first mixer and the high-temperature condensate inlet of the surface cooler section;

[0052] The control module is used to acquire the first water flow pressure value and the second water flow pressure value, and when the difference between the first water flow pressure value and the second water flow pressure value is greater than the first differential pressure threshold, it controls the second bypass valve to open, so that the high-temperature mixed condensate flows into the high-temperature condensate inlet of the surface cooler section through the second bypass valve.

[0053] Optionally, it may also include a display module and a storage module;

[0054] The control module is used for:

[0055] Calculate the real-time operating efficiency value of the surface cooler section and store the real-time operating efficiency value in the storage module;

[0056] Calculate the average efficiency of the real-time working efficiency value in the storage module within a first preset time period;

[0057] The operating status of the surface cooler section is determined based on the real-time working efficiency value and the average efficiency value.

[0058] Based on the operating status, the display module is controlled to display preset operation reminders.

[0059] In a second aspect, the present invention also provides a control method for an air conditioning system, which is executed using the air conditioning system described in any one of the first aspects, the control method comprising:

[0060] The flow rate of the high-temperature mixed condensate is adjusted by controlling the condensate pump according to the heat load requirement of the air to be heated;

[0061] The outdoor temperature value is obtained, and based on the outdoor temperature value, the two steam valves are controlled to adjust the flow rate of the high-temperature steam input to the preheating section and the steam heating section, respectively.

[0062] The air conditioning system and its control method provided by this invention input the high-temperature condensate generated in the preheating and steam heating sections of the air conditioning system into the surface cooler section. Heat exchange between the high-temperature condensate and the air to be heated is achieved in the surface cooler section, avoiding heat waste and providing auxiliary heating for the air. This effectively saves on the amount of high-temperature steam used in the subsequent steam heating section, reducing energy consumption. Simultaneously, it avoids the hazards caused by directly discharging the high-temperature condensate generated in the preheating and steam heating sections into the sewage system, solves the problem of the surface cooler section being idle in winter, and improves equipment utilization.

[0063] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of the present invention, nor is it intended to limit the scope of the invention. Other features of the invention will become readily apparent from the following description. Attached Figure Description

[0064] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0065] Figure 1 A schematic diagram of an air conditioning system provided in an embodiment of the present invention;

[0066] Figure 2 This is a schematic diagram of another air conditioning system provided in an embodiment of the present invention;

[0067] Figure 3 This is a schematic diagram of another air conditioning system provided in an embodiment of the present invention;

[0068] Figure 4 This is a schematic diagram of another air conditioning system provided in an embodiment of the present invention;

[0069] Figure 5 This is a schematic diagram of another air conditioning system provided in an embodiment of the present invention;

[0070] Figure 6 This is a flowchart illustrating a control method for an air conditioning system according to an embodiment of the present invention. Detailed Implementation

[0071] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0072] The terminology used in the embodiments of this invention is for the purpose of describing specific embodiments only and is not intended to limit the invention. It should be noted that directional terms such as "upper," "lower," "left," and "right" described in the embodiments of this invention are used to describe the angles shown in the accompanying drawings and should not be construed as limiting the embodiments of this invention. Furthermore, in the context, it should be understood that when referring to an element being formed "on" or "below" another element, it can be formed not only directly on or below the other element, but also indirectly on or below it through intermediate elements. The terms "first," "second," etc., are used for descriptive purposes only and do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0073] The term "comprising" and its variations as used in this invention are open-ended, meaning "including but not limited to". The term "based on" means "at least partially based on". The term "one embodiment" means "at least one embodiment".

[0074] It should be noted that the concepts of "first" and "second" mentioned in this invention are only used to distinguish the corresponding contents and are not used to limit the order or interdependence.

[0075] It should be noted that the terms "a" and "a plurality of" used in this invention are illustrative rather than restrictive. Those skilled in the art should understand that, unless otherwise expressly indicated in the context, they should be understood as "one or more".

[0076] Figure 1 A schematic diagram of an air conditioning system provided in an embodiment of the present invention is shown below. Figure 1 As shown, the air conditioning system includes a preheating section 10, a surface cooler section 20, a steam heating section 30, a first mixer 401, a condensate pump 50, two steam valves 60, an outdoor temperature sensor (not shown in the figure), and a control module (not shown in the figure). The condensate pump, the two steam valves, and the outdoor temperature sensor are connected to the control module. The preheating section 10, the surface cooler section 20, and the steam heating section 30 each include an air inlet and an air outlet, which are connected sequentially. The air inlet 101 of the preheating section 10 is used to receive air to be heated, and the air outlet 302 of the steam heating section 30 is used to output heated air. The preheating section 10 also includes a first steam inlet 104 and a first condensate outlet 103. The first steam inlet 104 is used to receive high-temperature steam to heat the air to be heated, and the first condensate outlet 103 is used to output high-temperature condensate generated by the preheating section 10. The steam heating section 30 also includes a second steam inlet 304 and a second condensate outlet 303. The second steam inlet receives high-temperature steam to heat the air to be heated output from the surface cooler section 20. The second condensate outlet 303 outputs high-temperature condensate generated by the steam heating section 30. The first condensate outlet 103 is connected to the first inlet 4011 of the first mixer 401, and the second condensate outlet 303 is connected to the second inlet 4012 of the first mixer 401 to form high-temperature mixed condensate at the outlet 4013 of the first mixer 401. The surface cooler section 20 includes a high-temperature condensate inlet 203 and a low-temperature condensate outlet 204. The high-temperature condensate inlet 203 is connected to the outlet 4013 of the first mixer 401 to receive the high-temperature mixed condensate, and the low-temperature condensate outlet 204 outputs low-temperature condensate after heat exchange with the air to be heated.

[0077] Specifically, such as Figure 1As shown, the air conditioning system includes a preheating section 10, a surface cooler section 20, and a steam heating section 30. The air outlet 102 of the preheating section 10 is connected to the air inlet 201 of the surface cooler section 20, and the air outlet 202 of the surface cooler section 20 is connected to the air inlet 301 of the steam heating section 30. When the air conditioning system heats the air to be heated, the air enters through the air inlet 101 of the preheating section 10, passes through the preheating section 10, the surface cooler section 20, and the steam heating section 30 in sequence for heating, and finally exits from the air outlet 302 of the steam heating section 30.

[0078] Furthermore, the preheating section 10 also includes a first steam inlet 104 and a first condensate outlet 103, and the steam heating section 30 also includes a second steam inlet 304 and a second condensate outlet 303. Both the first steam inlet 104 and the second steam inlet 304 are used to receive high-temperature steam. Both the preheating section 10 and the steam heating section 30 use high-temperature steam to exchange heat with the air to be heated. After releasing heat in the preheating section 10 and the steam heating section 30, the high-temperature steam condenses into water, forming high-temperature condensate. The high-temperature condensate generated in the preheating section 10 and the steam heating section 30 flows to the first mixer 401 through the first condensate outlet 103 and the second condensate outlet 303, respectively. In the first mixer 401, the high-temperature condensate generated in the preheating section 10 and the steam heating section 30 is mixed to obtain high-temperature mixed condensate.

[0079] Furthermore, the high-temperature mixed condensate flows from the outlet 4013 of the first mixer 401 to the high-temperature condensate inlet 203 of the surface cooler section 20. When the air to be heated after passing through the preheating section 20 enters the surface cooler section 20, it exchanges heat with the high-temperature mixed condensate in the surface cooler section 20, thereby cooling the high-temperature mixed condensate and obtaining low-temperature condensate. Furthermore, the low-temperature condensate flows out from the low-temperature condensate outlet 204 of the surface cooler section 20.

[0080] It should be noted that the temperatures of the preheating section 10, the surface cooler section 20, and the steam heating section 30 should gradually increase when heating the air to be heated. Specifically, the temperature of the high-temperature steam in the preheating section 10 should be lower than the temperature of the high-temperature mixed condensate in the surface cooler section 20, and the temperature of the high-temperature mixed condensate in the surface cooler section 20 should be lower than the temperature of the high-temperature steam in the steam heating section 30. This achieves gradual heating of the air to be heated. It can be understood that the temperature of the high-temperature condensate produced in the preheating section 10 is lower than the temperature of the high-temperature condensate produced in the steam heating section 30. For example, the temperature range of the high-temperature condensate produced in the preheating section 10 can be 75-85℃, and the temperature of the high-temperature condensate produced in the steam heating section 30 can be 85-95℃. Thus, when the high-temperature condensate produced in the preheating section 10 and the steam heating section 30 is mixed in the first mixer 401, the temperature range requirement of the surface cooler section 20 for the high-temperature mixed condensate can be met.

[0081] It is understandable that before the air to be heated enters the steam heating section 30, the air to be heated is auxiliary heated in the surface cooler section 20 to raise the temperature of the air before it enters the steam heating section 30 for heating. This avoids the waste of heat from the high-temperature condensate generated in the preheating section 10 and the steam heating section 30, and also reduces the amount of high-temperature steam used in the steam heating section 30, thus reducing energy consumption.

[0082] Furthermore, such as Figure 1 As shown, the condensate pump 50 is located between the high-temperature condensate inlet 203 and the outlet 4013 of the first mixer 401. The control module is used to control the condensate pump 50 to adjust the flow rate of the high-temperature mixed condensate according to the heat load demand of the air to be heated. An outdoor temperature sensor is used to detect the outdoor temperature and obtain the outdoor temperature value. Two steam valves 60 are respectively connected to the first steam inlet 104 of the preheating section 10 and the second steam inlet 304 of the steam heating section 30. The control module is used to obtain the outdoor temperature value and, according to the outdoor temperature value, control the two steam valves 60 to adjust the flow rate of the high-temperature steam input to the preheating section 10 and the steam heating section 30 respectively.

[0083] Specifically, since the temperature of the air to be heated differs from the expected temperature of the already heated air under different outdoor temperatures, the required heat load for the air to be heated also varies when using an air conditioning system. Furthermore, the control module can adjust the flow rate of the high-temperature mixed condensate by controlling the condensate pump 50 according to the required heat load of the air to be heated, thereby meeting the different heat load requirements of the air to be heated.

[0084] Furthermore, the outdoor temperature sensor can detect the outdoor temperature value in real time. The control module can control the opening of the two steam valves 60 based on the outdoor temperature value, thereby adjusting the flow rate of high-temperature steam entering the preheating section 10 and the steam heating section 30. Specifically, when the outdoor temperature is low, the opening of the steam valves 60 in the preheating section 10 and the steam heating section 30 can be increased to accelerate the flow rate of high-temperature steam entering the preheating section 10 and the steam heating section 30, achieving rapid heating of the air to be heated. At this time, the speed of the condensate pump 50 can also be appropriately reduced to decrease the utilization rate of the surface cooler section 20 when the outdoor temperature is low, allowing the preheating section 10 and the steam heating section 30 to play the main heating role. When the outdoor temperature is moderate, the control module can appropriately reduce the opening of the steam valves 60 in the preheating section 10 and the steam heating section 30 to reduce the amount of high-temperature steam used. At this time, the speed of the condensate pump 50 can be increased to allow the surface cooler section 20 to play the main heating role.

[0085] This invention, in its embodiment, inputs the high-temperature condensate generated in the preheating and steam heating sections of the air conditioning system into the surface cooler section. Heat exchange between the high-temperature condensate and the air to be heated is achieved in the surface cooler section, avoiding heat waste and providing auxiliary heating for the air. This effectively reduces the amount of high-temperature steam used in the subsequent steam heating section, lowering energy consumption. Simultaneously, it avoids the hazards caused by directly discharging the high-temperature condensate generated in the preheating and steam heating sections into the sewage system, solves the problem of the surface cooler section being idle in winter, and improves equipment utilization.

[0086] Optionally, refer to Figure 1 The control module is used to: adjust the opening degree x of the two steam valves according to the formula x=70+min(30, (-10-T)×3) when the outdoor temperature value T is less than the first outdoor temperature threshold; adjust the opening degree x of the two steam valves according to the formula x=30+(0-T)×4 when the outdoor temperature value T is greater than or equal to the first outdoor temperature threshold and less than the second outdoor temperature threshold; adjust the opening degree x of the two steam valves according to the formula x=max(0, (30-T)×3) when the outdoor temperature value T is greater than or equal to the second outdoor temperature threshold and less than the third outdoor temperature threshold; and set the opening degree x of the two steam valves to 0 when the outdoor temperature value T is greater than or equal to the third outdoor temperature threshold.

[0087] Specifically, based on the outdoor temperature detected by the outdoor temperature sensor, under different outdoor temperature conditions, the control module can control the opening degree of the two steam valves 60 to control the flow rate of high-temperature steam into the preheating section 10 and the steam heating section 30, thereby controlling the heating rate and heating amount of the air to be heated. Further, after the outdoor temperature sensor detects the original outdoor temperature value, the original outdoor temperature value is input into the control module. The control module preprocesses the original outdoor temperature value to obtain an accurate outdoor temperature value. For example, the preprocessing includes using a 5-point moving average algorithm to filter the original outdoor temperature value, eliminating the influence of instantaneous fluctuations, thereby ensuring data stability.

[0088] Furthermore, when the outdoor temperature T is less than the first outdoor temperature threshold, the opening degree x of the two steam valves 60 is adjusted according to the formula x=70+min(30, (-10-T)×3). For example, the first outdoor temperature threshold can be -10℃. When the outdoor temperature T < -10℃, the opening degree x of the two steam valves 60 is adjusted according to the formula x=70+min(30, (-10-T)×3). The range of the opening degree x of the two steam valves 60 is 70%-100%. The lower the outdoor temperature, the larger the opening degree of the two steam valves 60, until both steam valves 60 are fully open. At this time, the flow rate of high-temperature steam into the preheating section 10 and the steam heating section 30 is the largest. The air conditioning system is in enhanced heating mode, the heating speed of the air to be heated is the fastest, and the energy consumption is relatively high.

[0089] Furthermore, when the outdoor temperature T is greater than or equal to the first outdoor temperature threshold and less than the second outdoor temperature threshold, the opening degree x of the two steam valves 60 is adjusted according to the formula x = 30 + (0 - T) × 4. For example, the second outdoor temperature threshold can be 0℃. When -10℃ ≤ T < 0℃, the opening degree x of the two steam valves 60 is adjusted according to the formula x = 70 + min(30, (-10 - T) × 3). The range of the opening degree x of the two steam valves 60 is then 30%-70%. It can be seen that as the outdoor temperature rises, the opening degree of the two steam valves 60 decreases accordingly, thus avoiding unnecessary energy waste. At this time, the air conditioning system is in standard heating mode, and energy consumption is relatively balanced.

[0090] Furthermore, when the outdoor temperature T is greater than or equal to the second outdoor temperature threshold and less than the third outdoor temperature threshold, the opening degree x of the two steam valves 60 is adjusted according to the formula x=max(0, (30-T)×3). For example, the third outdoor temperature threshold can be 10℃. When 0℃≤T<10℃, the opening degree x of the two steam valves 60 is adjusted according to the formula x=max(0, (30-T)×3), and the range of the opening degree x of the two steam valves 60 is 0-30%. At this time, the two steam valves 60 have a small opening, and the air conditioning system is in energy-saving heating mode, with high energy efficiency.

[0091] Furthermore, when the outdoor temperature T is greater than or equal to the third outdoor temperature threshold, the opening degree x of the two steam valves 60 is set to 0. For example, when T ≥ 10℃, the outdoor temperature is high, and the air conditioning system does not need to heat. Therefore, the opening degree x of the two steam valves 60 is set to 0, and the air conditioning system is in transitional season mode, which has energy-saving efficiency.

[0092] In an optional embodiment, when the control module controls the opening degree of the two steam valves 60 based on the outdoor temperature value, the opening degree of the two steam valves 60 needs to be adjusted gradually to avoid damage to the system caused by drastic changes. Furthermore, this embodiment of the invention also includes a storage module, which can store the opening degree of the steam valves 60 when the control module controls the opening degree of the two steam valves 60 based on the outdoor temperature value for later review.

[0093] According to the outdoor temperature value detected by the outdoor temperature sensor, the two steam valves are controlled to have different opening degrees at different outdoor temperature values, so as to match the steam valve opening degree with the outdoor temperature. When the outdoor temperature is high, the opening degree of the steam valve is reduced, so that the air conditioning system operates in energy-saving heating mode or transitional season mode, thereby avoiding unnecessary energy waste. When the outdoor temperature is low, the opening degree of the steam valve is increased, so that the air conditioning system operates in enhanced heating mode or standard heating mode, thereby accelerating the heating speed of the air to be heated.

[0094] Optionally, Figure 2 This is a schematic diagram of another air conditioning system provided in an embodiment of the present invention, such as... Figure 2 As shown, the air conditioning system also includes a first temperature sensor 701, a first flow valve 801, and a second flow valve 802. The first temperature sensor 701, first flow valve 801, and second flow valve 802 are respectively connected to the control module. The first temperature sensor 701 is connected to the outlet 4013 of the first mixer 401 and is used to detect the temperature of the high-temperature mixed condensate to obtain its temperature value. The first flow valve 801 is located between the first condensate outlet 103 of the preheating section 10 and the first inlet 4011 of the first mixer 401. The second flow valve 802 is located between the second condensate outlet 303 of the steam heating section 30 and the second inlet 4012 of the first mixer 401. The control module is used to obtain the high-temperature mixed condensate temperature value, and when the high-temperature mixed condensate temperature value exceeds a preset condensation temperature range, it controls the first flow valve 801 to adjust the flow rate of the high-temperature condensate generated in the preheating section 10, and controls the second flow valve 802 to adjust the flow rate of the high-temperature condensate generated in the steam heating section 30.

[0095] Specifically, as the air to be heated sequentially passes through the preheating section 10, the surface cooler section 20, and the steam heating section 30, these sections gradually heat the air. Therefore, the temperature of the high-temperature mixed condensate entering the surface cooler section 20 needs to be within a preset condensation temperature range. If the temperature of the high-temperature mixed condensate is too low, it may not effectively heat the air and could easily cause the condensate to freeze. If the temperature of the high-temperature mixed condensate is too high, the surface cooler section 20 may deform due to overheating. Furthermore, since the temperature of the high-temperature condensate produced in the preheating section 10 is lower than that produced in the steam heating section 30, the temperature of the high-temperature mixed condensate entering the surface cooler section 20 can be controlled by adjusting the mixing ratio of the high-temperature condensate produced in the preheating section 10 and the steam heating section 30 entering the first mixer 401.

[0096] Further, refer to Figure 2 A first temperature sensor 701 is connected to the outlet 4013 of the first mixer 401 to detect the temperature of the high-temperature mixed condensate, obtain the high-temperature mixed condensate temperature value, and input the high-temperature mixed condensate temperature value into the control module. When the high-temperature mixed condensate temperature value exceeds the preset condensation temperature range, the control module controls the first flow valve 801 to adjust the flow rate of the high-temperature condensate generated in the preheating section 10, and controls the second flow valve 802 to adjust the flow rate of the high-temperature condensate generated in the steam heating section 30. The first flow valve 801 is located between the first condensate outlet 103 of the preheating section 10 and the first inlet 4011 of the first mixer 401, and the second flow valve 802 is located between the second condensate outlet 303 of the steam heating section 30 and the second inlet 4012 of the first mixer 401. For example, the preset condensation temperature range can be 80-90℃, the temperature range of the high-temperature condensate generated in the preheating section 10 can be 75-85℃, and the temperature of the high-temperature condensate generated in the steam heating section 30 can be 85-95℃.

[0097] When the temperature of the high-temperature mixed condensate is greater than 90°C, the control module can control the first flow valve 801 to increase the flow rate of the high-temperature condensate entering the preheating section 10 of the first mixer 401, and control the second flow valve 802 to decrease the flow rate of the high-temperature condensate entering the steam heating section 30 of the first mixer 401. When the temperature of the high-temperature mixed condensate is less than 80°C, the control module can control the first flow valve 801 to decrease the flow rate of the high-temperature condensate entering the preheating section 10 of the first mixer 401, and control the second flow valve 802 to increase the flow rate of the high-temperature condensate entering the steam heating section 30 of the first mixer 401. This achieves temperature regulation of the high-temperature mixed condensate entering the surface cooler section 20. Furthermore, the control module can store the adjustment operations of the first flow valve 801 and the second flow valve 802 in the storage module for later review.

[0098] This invention, through the setting of a first flow valve and a second flow valve, achieves flow regulation of the high-temperature condensate generated in the preheating section and the steam heating section, thereby achieving temperature regulation of the high-temperature mixed condensate entering the surface cooler section.

[0099] Optionally, Figure 3 This is a schematic diagram of another air conditioning system provided in an embodiment of the present invention, such as... Figure 3 As shown, the air conditioning system also includes a flow meter 90, which is connected to the control module. The flow meter 90 is connected to the high-temperature condensate inlet 203 and is used to detect the current flow rate of the high-temperature mixed condensate. The control module is used to: obtain the current flow rate of the high-temperature mixed condensate. ; Obtain the current speed of condensate pump 50 Based on the heat load requirement of the air to be heated Calculate the target flow rate of high-temperature mixed condensate. Based on target traffic Current traffic and current speed Control the latest speed of condensate pump 50 .

[0100] Specifically, the heat load required for the air to be heated varies under different temperature conditions, therefore, it can be determined based on the heat load requirement of the air to be heated. The PID algorithm is used to optimize the speed of the condensate pump 50 in real time, so that the heat supply of the surface cooler section 20 can meet the heat load requirements of the air to be heated. Requirements.

[0101] Specifically, in order to calculate the target flow rate of the high-temperature mixed condensate... First, it is necessary to determine the heat load requirement of the air to be heated. If the preset air temperature of the heated air in the air conditioning system is [value missing]... The air temperature entering the air inlet 201 of the surface cooler section 20, detected by a temperature sensor (not shown in the figure), is... The heat load requirement of the air to be heated ,in The airflow rate of the air to be heated entering the air conditioning system is detected by an airflow sensor (not shown in the figure), and its unit is _____. , The density of the air to be heated. , The specific heat capacity at constant pressure of the air to be heated. The heat load requirement of the air to be heated. This indicates the combined heat load requirement for the surface cooler section 20 and the steam heating section 30. It should be noted that this is to ensure the heat load requirement for the air to be heated is met. The effectiveness of the heat load requirement of the air to be heated. When the value is negative, it represents the heat load requirement of the air to be heated. Defined as 0. The control module can determine the heat load requirement of the air to be heated. It is stored in the storage module.

[0102] Furthermore, the actual heat supply of the high-temperature mixed condensate in the surface cooler section 20 is calculated. This allows us to determine the actual heat supply of the high-temperature mixed condensate in the surface cooler section 20. The heat load demand of the air to be heated The percentage. (Reference) Figure 3 The air conditioning system also includes a third temperature sensor 703 and a fourth temperature sensor 704. The third temperature sensor 703 is connected to the high-temperature condensate inlet 203 of the surface cooler section 20 and is used to detect the temperature of the high-temperature mixed condensate entering the surface cooler section 20 to obtain the condensate inlet temperature value. The fourth temperature sensor 704 is connected to the low-temperature condensate outlet 204 of the surface cooler section 20, and is used to detect the temperature of the low-temperature condensate after heat exchange with the air to be heated in the surface cooler section 20, and obtain the low-temperature condensate temperature value. Understandably, the low-temperature condensate water temperature value... Less than the condensate inlet water temperature value The actual heat supply of the high-temperature mixed condensate in section 20 of the surface cooler can be determined based on the difference between the two values. The actual heat supply of the high-temperature mixed condensate in section 20 of the surface cooler. ,in The flow rate of the current high-temperature mixed condensate, detected by flow meter 90, is expressed in units of... , The specific heat capacity of water, .

[0103] Based on this, the heat load requirement of the air to be heated can be determined. The actual heat supply of the high-temperature mixed condensate in section 20 of the surface cooler Determine the actual heating capacity percentage k1 of the surface cooler section 20, where This indicates the contribution rate of the surface cooler section 20 when the air to be heated is heated through the surface cooler section 20 and the steam heating section 30. In other words, the larger the heating capacity ratio k1 of the surface cooler section 20, the more effectively the air to be heated to the preset air temperature value will be heated in the steam heating section 30. The less high-temperature steam required, the less energy is consumed. However, since the temperature of the high-temperature mixed condensate in the surface cooler section 20 is lower than the temperature of the high-temperature steam in the steam heating section 30, the surface cooler section 20 heats up the air to be heated at a slower rate than the steam heating section 30.

[0104] Furthermore, in order to better meet the requirements of heating efficiency and energy consumption of the air conditioning system under different outdoor temperature values, the target proportion k2 of the heating capacity of the surface cooler section 20 can be preset in the control module, so that the surface cooler section 20 has different contribution rates under different outdoor temperature values, so as to cooperate with the opening degree of the two steam valves 60 to achieve the purpose of high efficiency and energy saving.

[0105] Specifically, when the outdoor temperature T is less than the first outdoor temperature threshold, the opening degree x of the two steam valves 60 is adjusted according to the formula x=70+min(30, (-10-T)×3). Furthermore, the target proportion k2 of the heating capacity of the surface cooler section 20 can be preset to 0.85. At this time, the air conditioning system is in enhanced heating mode, with the steam heating section 30 responsible for primary heating of the air to be heated, and the surface cooler section 20 responsible for auxiliary heating, so that the air to be heated can be heated quickly. The energy consumption level of the air conditioning system is high energy consumption. When the outdoor temperature T is greater than or equal to the first outdoor temperature threshold and less than the second outdoor temperature threshold, the opening degree x of the two steam valves 60 is adjusted according to the formula x=30+(0-T)×4. At this time, the target proportion k2 of the heating capacity of the surface cooler section 20 can be preset to 0.9, increasing the contribution rate of the surface cooler section 20 in heating the air to be heated, so that the steam heating section 30 can reduce the opening degree of the steam valves 60 to reduce the amount of high-temperature steam used. At this time, the air conditioning system is in standard heating mode, and the energy efficiency level is balanced. When the outdoor temperature T is greater than or equal to the second outdoor temperature threshold and less than the third outdoor temperature threshold, the opening degree x of the two steam valves 60 is adjusted according to the formula x=max(0, (30-T)×3). At this time, the outdoor temperature is relatively high, and the air to be heated can be heated solely by the surface cooler section 20. Therefore, the target proportion k2 of the heating capacity of the surface cooler section 20 can be preset to 1, thus enabling the air conditioning system to be in energy-saving heating mode with an energy efficiency rating of high efficiency. When the outdoor temperature T is greater than or equal to the third outdoor temperature threshold, the opening degree x of the two steam valves 60 is set to 0. At this time, the air to be heated already has a good temperature, so there is no need to use the surface cooler section 20 and the steam valve heating section 30 to heat the air to be heated. The target proportion k2 of the heating capacity of the surface cooler section 20 can be preset to 0. At this time, the air conditioning system is in transitional season mode with an energy efficiency rating of energy saving.

[0106] Based on this, under different outdoor temperature values, the target proportion k2 of the heating capacity of the surface cooler section 20 preset in the control module is obtained, and it is compared with the actual heating capacity proportion k1 of the surface cooler section 20 to determine whether the actual heating capacity of the surface cooler section 20 meets the target requirement. If the requirement is not met, the output adjustment coefficient m is calculated, and the latest speed n of the condensate pump 50 is controlled according to the output adjustment coefficient m. t This allows for the adjustment of the actual heating capacity of the surface cooler section 20.

[0107] Specifically, output adjustment coefficient ,in This is the proportionality coefficient. The initial value of the integral term, The integral coefficient is... Here, is the differential coefficient, and t is the sampling time interval. For example, It can be 0.6. It can be 0, It can be 0.08. The value can be 0.12, and t can be 2 seconds. Furthermore, the output adjustment coefficient can be set in the control module. The minimum value is 0.3 and the maximum value is 1. When the output adjustment coefficient m is less than 0.3, the output adjustment coefficient m is set to 0.3. When the output adjustment coefficient m is greater than 1, the output adjustment coefficient m is set to 1.

[0108] Furthermore, based on the output adjustment coefficient m, the latest speed of the condensate pump 50 is controlled. In practice, the actual heating capacity of the surface cooler section 20 is altered by adjusting the speed of the condensate pump 50 based on the error between the target heating capacity ratio k2 and the actual heating capacity ratio k1 of the surface cooler section 20. This adjustment controls the flow rate of the high-temperature mixed condensate entering the surface cooler section 20. Furthermore, since the high-temperature mixed condensate in the surface cooler section 20 is supplied by the preheating section 10 and the steam heating section 30, the basic flow rate that the preheating section 10 and the steam heating section 30 can provide to the surface cooler section 20 per unit time can be determined by detecting the output of high-temperature condensate produced by the preheating section 10 and the steam heating section 30 per unit time. However, since the target proportion k2 of the heating capacity of the surface cooler section 20 is different under different outdoor temperature conditions, the required target flow rate of the surface cooler section 20 under different outdoor temperature conditions is also different. They are also different, therefore they can be determined according to the formula. Calculate the target flow .

[0109] Furthermore, the flow meter 90 detects the current flow rate of the high-temperature mixed condensate entering the surface cooler section 20. and the current speed of condensate pump 50 and in the target traffic With current traffic The absolute value of the difference is greater than the current flow. At 10%, based on the target traffic Current traffic and current speed This allows us to obtain the latest rotational speed of the condensate pump 50, which is sufficient to meet the target proportion k2 of the heating capacity of the surface cooler section 20. ,in .

[0110] This invention enables real-time adjustment of the condensate pump speed based on the heat load demand of the air to be heated under different outdoor temperatures, thereby adjusting the flow rate of the high-temperature mixed condensate entering the surface cooler section. This achieves adaptive adjustment under different temperature conditions and solves the problems of slow response and low accuracy associated with fixed flow rate or simple proportional control.

[0111] Furthermore, in an optional embodiment, the maximum possible heat supply of the surface cooler section 20 can also be calculated. Based on calculation experience, the minimum temperature of the low-temperature condensate outlet 204 of the surface cooler section 20 is set in the control module to... The maximum possible heat supply of the surface cooler section 20 is then... Therefore, the current efficiency of the surface cooler section 20 can be calculated. To provide the maximum possible heat When the efficiency is 0, the efficiency of the surface cooler section 20 will be reduced. Set it to 0.

[0112] Furthermore, the heat gap of the surface cooler section 20 can also be calculated. .

[0113] Optionally, Figure 4 This is a schematic diagram of another air conditioning system provided in an embodiment of the present invention, such as... Figure 4As shown in the figure, the air conditioning system further includes a water quality detection device 100, a second temperature sensor 702, a first bypass valve 1101, and a second mixer 402. The second temperature sensor 702 and the first bypass valve 1101 are respectively connected to the control module. The water quality detection device 100 includes a low-temperature condensate water inlet 1001, a low-temperature drainage water outlet 1002, and a low-temperature return water outlet 1003. The low-temperature condensate water inlet 1001 of the water quality detection device 100 is connected to the low-temperature condensate water outlet 204 of the surface cooler section 20 for detecting the water quality of the low-temperature condensate water. The water inlet 11011 of the first bypass valve 1101 is connected to the low-temperature return water outlet 1003 of the water quality detection device 100, and the water outlet 11012 of the first bypass valve 1101 is connected to the second water inlet 4022 of the second mixer 402. The first water inlet 4021 of the second mixer 402 is connected to the second condensate water outlet 303 of the steam heating section 30. The water outlet 4023 of the second mixer 402 is connected to the second water inlet 4012 of the first mixer 401. The low-temperature drainage water outlet 1002 of the water quality detection device 100 is used to discharge the low-temperature condensate water when the water quality of the low-temperature condensate water is unqualified. The low-temperature return water outlet 1003 of the water quality detection device 100 is used to input the low-temperature condensate water to the water inlet 11011 of the first bypass valve 1101 when the water quality of the low-temperature condensate water is qualified. The second temperature sensor 702 is connected to the second condensate water outlet 303 of the steam heating section 30 for detecting the temperature of the high-temperature condensate water generated by the steam heating section 30 to obtain a condensate water temperature value. The control module is used to obtain the condensate water temperature value, and when the condensate water temperature value is higher than the first condensation temperature threshold, control the first bypass valve 1101 to open, so that the high-temperature condensate water generated by the steam heating section 30 is mixed with the low-temperature condensate water.

[0114] Specifically, referring to Figure 4 , the air conditioning system further includes a water quality detection device 100. The water quality detection device 100 is used to detect the water quality of the low-temperature condensate water, including the conductivity and pH value of the low-temperature condensate water. When the conductivity of the low-temperature condensate water is less than 80 μS / cm and the pH value is between 6.5 - 8.5, it is determined that the water quality of the low-temperature condensate water is qualified and can be recycled to the air conditioning system for reuse. When the above conditions are not met, if the conductivity of the low-temperature condensate water is between 80 - 150 μS / cm, the low-temperature condensate water is treated by a precision filter. If the conductivity of the low-temperature condensate water is greater than 150 μS / cm and the pH value is not between 6.5 - 8.5, the low-temperature condensate water needs to undergo three-stage deep purification treatment, including ion exchange desalination with a desalination rate not less than 95%, pH neutralization adjustment with an accuracy controlled within ±0.2, and ultrafiltration membrane filtration with a precision of 5 μm. After the unqualified low-temperature condensate water is treated, its water quality is detected again. After it is judged to be qualified, it can still be recycled to the air conditioning system for reuse. If it is judged to be unqualified, it is discharged to the cooling tower 120.

[0115] Further, refer to Figure 4 The air conditioning system also includes a second mixer 402, a second temperature sensor 702, and a first bypass valve 1101. The second temperature sensor 702 is connected to the second condensate outlet 303 of the steam heating section 30 and is used to detect the temperature of the high-temperature condensate generated by the steam heating section 30 to obtain the condensate temperature value. The inlet 11011 of the first bypass valve 1101 is connected to the low-temperature return water outlet 1003 of the water quality detection device 100, and the outlet 11012 of the first bypass valve 1101 is connected to the second inlet 4022 of the second mixer 402. The first inlet 4021 of the second mixer 402 is connected to the second condensate outlet 303 of the steam heating section 30. When the first bypass valve 1101 is open, the low-temperature condensate that has passed the water quality detection device 1002 will mix with the high-temperature condensate generated by the steam heating section 30 in the second mixer 402, thereby reducing the temperature of the high-temperature condensate entering the second inlet 4012 of the first mixer 401.

[0116] Furthermore, when the condensate temperature is higher than the first condensate temperature threshold, the control module controls the first bypass valve 1101 to open, thereby reducing the temperature of the high-temperature condensate entering the second inlet 4012 of the first mixer 401. When the condensate temperature is lower than the second condensate temperature threshold, the control module controls the first bypass valve 1101 to close, thereby blocking the low-temperature condensate from entering the second mixer 402, ensuring that the high-temperature condensate entering the second inlet 4012 of the first mixer 401 consists only of the high-temperature condensate generated by the steam heating section 30, preventing the temperature from becoming too low. For example, the first condensate temperature threshold can be 90°C, and the second condensate temperature threshold can be 80°C.

[0117] In an alternative embodiment, reference Figure 4The air conditioning system also includes a water collection tray 1301, a condensate transfer pump 1302, a level sensor 1303, and a steam trap 1401. The water collection tray 1301 includes an inlet and an outlet. The inlet of the water collection tray 1301 is connected to the first condensate outlet 103 of the preheating section 10 to collect the high-temperature condensate generated in the preheating section 10. The level sensor 1303 is connected to the water collection tray 1301 to detect the amount of high-temperature condensate in the water collection tray 1301 and obtain the condensate volume value. The condensate transfer pump 1302 is connected to the outlet of the water collection tray 1301 and, when the condensate volume value exceeds a first preset threshold, controls the input of the high-temperature condensate in the water collection tray 1301 to the first inlet 4011 of the first mixer 401. The steam trap 1401 includes an inlet and an outlet. The inlet of the steam trap 1401 is connected to the second condensate outlet 303 of the steam heating section 30 and is used to transport the high-temperature condensate generated by the steam heating section 30. The outlet of the steam trap 1401 is connected to the first inlet 4021 of the second mixer 402.

[0118] This invention utilizes the high-temperature condensate generated in the preheating and steam heating sections for heat exchange, avoiding energy waste. The resulting low-temperature condensate is then fed into a water quality testing device, solving the problems of equipment damage and poor accuracy associated with high-temperature testing. This improves the safety and accuracy of the testing and extends the lifespan of the equipment. Furthermore, the qualified low-temperature condensate is recycled back into the air conditioning system for reuse, preventing resource waste.

[0119] Optionally, Figure 5 This is a schematic diagram of another air conditioning system provided in an embodiment of the present invention, such as... Figure 5 As shown, the air conditioning system also includes a third temperature sensor 703 and a temperature regulating valve 1102. The third temperature sensor 703 and the temperature regulating valve 1102 are respectively connected to the control module. The third temperature sensor 703 is connected to the high-temperature condensate inlet 203 of the surface cooler section 20 and is used to detect the temperature of the high-temperature mixed condensate to obtain the condensate inlet temperature value. The inlet 11021 of the temperature regulating valve 1102 is connected to the low-temperature return water outlet 1003 of the water quality detection device 20, and the outlet 11022 of the temperature regulating valve 1102 is connected to the high-temperature condensate inlet 203 of the surface cooler section 20. The control module is used to obtain the condensate inlet temperature value and, based on the condensate inlet temperature value, control the opening degree of the temperature regulating valve 1102 to mix the low-temperature condensate with the high-temperature mixed condensate.

[0120] Specifically, refer to Figure 5To prevent the temperature of the high-temperature mixed condensate entering the surface cooler section 20 from becoming too high, the air conditioning system also includes a third temperature sensor 703 and a temperature regulating valve 1102. The third temperature sensor 703 is used to detect the temperature of the high-temperature mixed condensate entering the surface cooler section 20 and obtain the condensate inlet temperature value. Further, the control module controls the opening of the temperature regulating valve 1102 based on the condensate inlet temperature value. When the condensate inlet temperature value is higher than the first condensation temperature threshold, the opening of the temperature regulating valve 1102 is increased, allowing more low-temperature condensate to mix with the high-temperature mixed condensate, thereby reducing the temperature of the high-temperature mixed condensate entering the surface cooler section 20. When the condensate inlet temperature value is lower than the second condensation temperature threshold, the temperature regulating valve 1102 is closed to prevent the temperature of the high-temperature mixed condensate entering the surface cooler section 20 from further decreasing.

[0121] Optionally, refer to Figure 5 The air conditioning system also includes a fourth temperature sensor 704 and a fifth temperature sensor (not shown in the figure). The fourth and fifth temperature sensors are connected to the control module. The fourth temperature sensor 704 is connected to the low-temperature condensate outlet 204 of the surface cooler section 20 and is used to detect the low-temperature condensate temperature at the outlet 204 to obtain the low-temperature condensate temperature value. The fifth temperature sensor (not shown in the figure) is located on the surface of the surface cooler section 20 and is used to detect the surface temperature of the surface cooler section 20 to obtain the surface temperature value. The control module is used to acquire the low-temperature condensate temperature value and the surface temperature value, and when the low-temperature condensate temperature value is less than the first antifreeze temperature threshold, or the surface temperature value is less than the second antifreeze temperature threshold, it controls the condensate pump 50 to increase its speed and controls the first bypass valve 1101 and the temperature regulating valve 1102 to close.

[0122] Specifically, in order to prevent the surface cooler section 20 from being damaged due to excessively low temperature, the temperature of the low-temperature condensate at the low-temperature condensate outlet 204 is detected by the fourth temperature sensor 704 and the temperature of the surface of the surface cooler section 20 is detected by the fifth temperature sensor, thereby determining whether there is a risk of freezing.

[0123] Furthermore, when the low-temperature condensate temperature is lower than the first antifreeze temperature threshold, or the surface temperature is lower than the second antifreeze temperature threshold, the control module controls the condensate pump 50 to increase its speed and controls the first bypass valve 1101 and temperature regulating valve 1102 to close. This increases the rate at which the high-temperature mixed condensate enters the surface cooler section 20. Simultaneously, the first bypass valve 1101 and temperature regulating valve 1102 are closed to prevent the low-temperature condensate from mixing with the high-temperature condensate generated in the steam heating section 30, as well as the low-temperature condensate from mixing with the high-temperature mixed condensate. This maintains the high-temperature mixed condensate at a higher temperature, preventing the surface cooler section 20 from freezing. For example, the first antifreeze temperature threshold can be 10°C, and the second antifreeze temperature threshold can be 5°C.

[0124] Furthermore, the air conditioning system also includes an alarm module connected to the control module. When the low-temperature condensate temperature is lower than the third antifreeze temperature threshold, or the surface temperature is lower than the fourth antifreeze temperature threshold, the control module sends an alarm signal to the alarm module. The alarm module then executes an alarm action based on the alarm signal, thereby notifying maintenance personnel to intervene promptly and inspect the air conditioning system. For example, the third antifreeze temperature threshold can be 5°C, and the fourth antifreeze temperature threshold can be 2°C.

[0125] Furthermore, the air conditioning system also includes a drain valve (not shown in the figure), which is connected to the low-temperature condensate outlet 204 of the surface cooler section 20. When the surface temperature value is lower than the fifth antifreeze temperature threshold, the control module controls the air conditioning system to stop and simultaneously controls the drain valve to open, discharging the high-temperature mixed condensate in the surface cooler section 20. For example, the fifth antifreeze temperature threshold can be 0°C.

[0126] This invention, by detecting the surface temperature of the surface cooler section and the temperature of the low-temperature condensate outlet, and taking different response tests at different temperatures, effectively avoids the freezing of the high-temperature mixed condensate in the surface cooler section, which would affect the operation of the entire air conditioning system.

[0127] Optionally, refer to Figure 5 The air conditioning system also includes a coarse filter 1500, a first pressure sensor 1501, a second pressure sensor 1502, and a second bypass valve 1103. The first pressure sensor 1501, the second pressure sensor 1502, and the second bypass valve 1103 are respectively connected to the control module. The coarse filter 1500 is located between the outlet 4013 of the first mixer 401 and the high-temperature condensate inlet 203 of the surface cooler section 20, and is used to filter the high-temperature mixed condensate. The first pressure sensor 1501 is connected to the inlet of the coarse filter 1500 and is used to detect the water flow pressure at the inlet of the coarse filter 1500 to obtain a first water flow pressure value. The second pressure sensor 1502 is connected to the outlet of the coarse filter 1500 and is used to detect the water flow pressure at the outlet of the coarse filter 1500 to obtain a second water flow pressure value. The second bypass valve 1103 is located between the outlet 4013 of the first mixer 401 and the high-temperature condensate inlet 203 of the surface cooler section 20. The control module is used to acquire the first water flow pressure value and the second water flow pressure value, and when the difference between the first water flow pressure value and the second water flow pressure value is greater than the first differential pressure threshold, it controls the second bypass valve 1103 to open, so that the high temperature mixed condensate flows through the second bypass valve 1103 into the high temperature condensate inlet 203 of the surface cooler section 20.

[0128] Specifically, the high-temperature condensate generated in the preheating section 10 and the steam heating section 30 is mixed in the first mixer 401 to produce high-temperature mixed condensate. Since impurities may exist inside the piping of the air conditioning system, the high-temperature mixed condensate needs to be filtered before entering the surface cooler section 20. (Reference) Figure 5 The coarse filter 1500 is located between the outlet 4013 of the first mixer 401 and the high-temperature condensate inlet 203 of the surface cooler section 20. It filters the high-temperature mixed condensate. Simultaneously, the first pressure sensor 1501 and the second pressure sensor 1502 detect the pressure values ​​before and after the coarse filter 1500, respectively, to obtain the first and second water flow pressure values. The operating status of the coarse filter is determined based on the difference between the first and second water flow pressure values. When the difference between the first and second water flow pressure values ​​exceeds a first differential pressure threshold, it is determined that the coarse filter 1500 is severely clogged. At this time, the control module controls the second bypass valve 1103 to open, allowing the high-temperature mixed condensate to flow into the high-temperature condensate inlet 203 of the surface cooler section 20, ensuring the air conditioning system continues to operate and preventing shutdown. Furthermore, the air conditioning system also includes a display module connected to the control module. When the difference between the first and second water flow pressure values ​​is greater than a second differential pressure threshold but less than or equal to the first differential pressure threshold, the control module sends a prompt message to the display module, alerting maintenance personnel that the coarse filter 1500 is clogged and needs to be cleaned promptly. For example, the first differential pressure threshold can be 0.08 MPa, and the second differential pressure threshold can be 0.05 MPa.

[0129] Optionally, the air conditioning system also includes a display module (not shown in the figure) and a storage module (not shown in the figure). The control module is used to: calculate the real-time operating efficiency value of the surface cooler section 20 and store the real-time operating efficiency value in the storage module; calculate the average efficiency value of the real-time operating efficiency value in the storage module over a first preset time period; determine the operating status of the surface cooler section 20 based on the real-time operating efficiency value and the average efficiency value; and control the display module to display preset operation reminders based on the operating status.

[0130] Specifically, the air temperature values ​​at the air inlet 201 and air outlet 202 of the surface cooler section 20 can be detected by temperature sensors (not shown in the figure), where the air temperature value at the air inlet 201 of the surface cooler section 20 is... The air temperature at the outlet 202 of the surface cooler section 20 is [value missing]. Then the heat gain on the air side of section 20 of the surface cooler can be calculated. Furthermore, the temperature of the high-temperature mixed condensate entering the surface cooler section 20 is detected by the third temperature sensor 703 to obtain the condensate inlet temperature value. The temperature of the low-temperature condensate after heat exchange with the air to be heated in the surface cooler section 20 is detected by the fourth temperature sensor 704, and the temperature value of the low-temperature condensate is obtained. It can calculate the heat release on the water side of section 20 of the surface cooler. .

[0131] Furthermore, heat is released on the water side of the surface cooler section 20. When the value is greater than 0, calculate the heat recovery efficiency of the surface cooler section 20. When the heat release W2 on the water side of the surface cooler section 20 is less than or equal to 0, the heat recovery efficiency of the surface cooler section 20 will be [value missing]. Record it as 0.

[0132] Furthermore, without considering heat loss, the maximum possible temperature rise of the air to be heated in the surface cooler section 20. The actual temperature rise of the air to be heated after passing through the surface cooler section 20 Therefore, when the maximum possible temperature rise of the air to be heated in the surface cooler section 20 is greater than 0, the temperature efficiency of the surface cooler section 20 is calculated. When the maximum possible temperature rise of the air to be heated in the surface cooler section 20 is less than or equal to 0, the temperature efficiency of the surface cooler section 20 will be reduced. Record it as 0.

[0133] Furthermore, the control module will optimize the heat recovery efficiency of the surface cooler section 20. and temperature efficiency The minimum value in the data is used as the real-time operating efficiency value of the surface cooler section 20 and stored in the storage module. When the real-time operating efficiency value of the surface cooler section 20 is greater than 85%, the control module controls the display module to display "Verify sensor calibration status". When the real-time operating efficiency value of the surface cooler section 20 is less than 60%, the control module calculates the average efficiency value of the real-time operating efficiency value in the storage module within a first preset time period, and compares the current real-time operating efficiency value of the surface cooler section 20 with the average efficiency value. When the current real-time operating efficiency value of the surface cooler section 20 is less than 80% of the average efficiency value, the control module controls the display module to display "Check if the surface cooler is clogged" and "Check if the airflow is balanced". For example, the first preset time period can be 24 hours. Simultaneously, when the real-time operating efficiency value of the surface cooler section 20 is less than 60%, the control module also checks the heat recovery efficiency of the surface cooler section 20. When the efficiency is less than 80%, the control module displays "Increase airflow by 10%" on the display module, indicating the heat recovery efficiency in the surface cooler section 20. When the airflow rate is greater than 120%, it indicates that the airflow rate has exceeded the current capacity of the high-temperature mixed condensate heating system, resulting in insufficient heat exchange and reduced heat recovery efficiency. At this time, the control module will display "Reduce airflow rate by 10%".

[0134] Furthermore, based on the maximum possible temperature rise of the air to be heated in the surface cooler section 20 It can calculate the theoretical maximum heat transfer of the surface cooler section 20. At this point, the heat exchange efficiency of the surface cooler section 20 can be calculated. .

[0135] The embodiments of the present invention can calculate the working efficiency of the surface cooler section in real time through the control module, and realize automated diagnosis based on the working efficiency value. At the same time, preset operation reminders are displayed on the display module, which helps maintenance personnel to locate problems and reduce maintenance costs.

[0136] Optionally, Figure 6 This invention provides a flowchart illustrating a control method for an air conditioning system, which is executed using any of the aforementioned air conditioning systems. Figure 6 As shown, the control methods include:

[0137] S101. Based on the heat load requirement of the air to be heated, control the condensate pump to adjust the flow rate of the high-temperature mixed condensate.

[0138] Specifically, because the temperature of the air to be heated and the expected temperature of the heated air differ under different outdoor temperatures, the required heat load for the air to be heated also varies when using an air conditioning system. Furthermore, the control module can adjust the flow rate of the high-temperature mixed condensate by controlling the condensate pump 50 according to the required heat load of the air to be heated, thereby meeting the different heat load requirements of the air to be heated.

[0139] S102. Obtain the outdoor temperature value, and based on the outdoor temperature value, control the two steam valves to adjust the flow rate of high-temperature steam input to the preheating section and the steam heating section respectively.

[0140] An outdoor temperature sensor can detect the outdoor temperature in real time. The control module can control the opening of two steam valves 60 based on the outdoor temperature, thereby regulating the flow rate of high-temperature steam entering the preheating section 10 and the steam heating section 30. Specifically, when the outdoor temperature is low, the opening of the steam valves 60 in the preheating section 10 and the steam heating section 30 can be increased to accelerate the flow rate of high-temperature steam entering these sections, achieving rapid heating of the air to be heated. At this time, the speed of the condensate pump can also be appropriately reduced to decrease the utilization rate of the surface cooler section 20 when the outdoor temperature is low, allowing the preheating section 10 and the steam heating section 30 to play the main heating role. When the outdoor temperature is moderate, the control module can appropriately reduce the opening of the steam valves 60 in the preheating section 10 and the steam heating section 30 to reduce the amount of high-temperature steam used. At this time, the speed of the condensate pump can be increased to allow the surface cooler section to play the main heating role.

[0141] According to different outdoor temperature values ​​and the heat load demand of the air to be heated, the embodiment of the present invention adjusts the speed of the condensate pump and the opening degree of the two steam valves, so as to match the steam valve opening degree, the speed of the condensate pump with the outdoor temperature and the heat load demand, thus avoiding unnecessary energy waste.

[0142] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, combinations, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention, the scope of which is determined by the scope of the appended claims.

Claims

1. An air conditioning system, characterized in that, include: The system includes a preheating section, a surface cooler section, a steam heating section, a first mixer, a condensate pump, two steam valves, an outdoor temperature sensor, and a control module; the condensate pump, the two steam valves, and the outdoor temperature sensor are respectively connected to the control module. The preheating section, the surface cooler section, and the steam heating section each include an air inlet and an air outlet. The air inlets and air outlets of the preheating section, the surface cooler section, and the steam heating section are connected in sequence. The air inlet of the preheating section is used to receive air to be heated, and the air outlet of the steam heating section is used to output heated air. The preheating section further includes a first steam inlet and a first condensate outlet. The first steam inlet is used to receive high-temperature steam to heat the air to be heated, and the first condensate outlet is used to output the high-temperature condensate generated by the preheating section. The steam heating section further includes a second steam inlet and a second condensate outlet. The second steam inlet is used to receive high-temperature steam to heat the air to be heated output from the surface cooler section, and the second condensate outlet is used to output the high-temperature condensate generated by the steam heating section. The first condensate outlet is connected to the first inlet of the first mixer, and the second condensate outlet is connected to the second inlet of the first mixer, so as to form high-temperature mixed condensate at the outlet of the first mixer; The surface cooler section includes a high-temperature condensate inlet and a low-temperature condensate outlet; the high-temperature condensate inlet is connected to the outlet of the first mixer and is used to receive the high-temperature mixed condensate; the low-temperature condensate outlet is used to output the low-temperature condensate after heat exchange with the air to be heated; The condensate pump is located between the high-temperature condensate inlet and the outlet of the first mixer; The control module is used to control the condensate pump to adjust the flow rate of the high-temperature mixed condensate according to the heat load demand of the air to be heated; The outdoor temperature sensor is used to detect the outdoor temperature and obtain the outdoor temperature value; The two steam valves are respectively connected to the first steam inlet of the preheating section and the second steam inlet of the steam heating section; The control module is used to acquire the outdoor temperature value and, based on the outdoor temperature value, control the two steam valves to adjust the flow rate of the high-temperature steam input to the preheating section and the steam heating section, respectively.

2. The air conditioning system according to claim 1, characterized in that, The control module is used for: When the outdoor temperature T is less than the first outdoor temperature threshold, the opening degree x of the two steam valves is adjusted according to the formula x=70+min(30, (-10-T)×3); When the outdoor temperature value T is greater than or equal to the first outdoor temperature threshold and less than the second outdoor temperature threshold, the opening degree x of the two steam valves is adjusted according to the formula x=30+(0-T)×4; When the outdoor temperature value T is greater than or equal to the second outdoor temperature threshold and less than the third outdoor temperature threshold, the opening degree x of the two steam valves is adjusted according to the formula x=max(0, (30-T)×3); When the outdoor temperature value T is greater than or equal to the third outdoor temperature threshold, the opening degree x of the two steam valves is set to 0.

3. The air conditioning system according to claim 1, characterized in that, It also includes a first temperature sensor, a first flow valve, and a second flow valve; the first temperature sensor, the first flow valve, and the second flow valve are respectively connected to the control module; The first temperature sensor is connected to the outlet of the first mixer to detect the temperature of the high-temperature mixed condensate and obtain the temperature value of the high-temperature mixed condensate. The first flow valve is located between the first condensate outlet of the preheating section and the first inlet of the first mixer; the second flow valve is located between the second condensate outlet of the steam heating section and the second inlet of the first mixer. The control module is used to acquire the temperature value of the high-temperature mixed condensate, and when the temperature value of the high-temperature mixed condensate exceeds the preset condensation temperature range, control the first flow valve to adjust the flow rate of the high-temperature condensate generated in the preheating section, and control the second flow valve to adjust the flow rate of the high-temperature condensate generated in the steam heating section.

4. The air conditioning system according to claim 1, characterized in that, It also includes a flow meter; the flow meter is connected to the control module; The flow meter is connected to the high-temperature condensate inlet and is used to detect the current flow rate of the high-temperature mixed condensate. The control module is used for: Obtain the current flow rate of the high-temperature mixed condensate; Obtain the current rotational speed of the condensate pump; Calculate the target flow rate of the high-temperature mixed condensate based on the heat load requirement of the air to be heated; The latest speed of the condensate pump is controlled based on the target flow rate, the current flow rate, and the current speed.

5. The air conditioning system according to claim 1, characterized in that, It also includes a water quality testing device, a second temperature sensor, a first bypass valve, and a second mixer; the second temperature sensor and the first bypass valve are respectively connected to the control module; The water quality testing device includes a low-temperature condensate inlet, a low-temperature drain outlet, and a low-temperature return water outlet. The low-temperature condensate inlet of the water quality testing device is connected to the low-temperature condensate outlet of the surface cooler section for detecting the water quality of the low-temperature condensate. The inlet of the first bypass valve is connected to the low-temperature return water outlet of the water quality detection device, and the outlet of the first bypass valve is connected to the second inlet of the second mixer. The first inlet of the second mixer is connected to the second condensate outlet of the steam heating section; the outlet of the second mixer is connected to the second inlet of the first mixer. When the water quality of the low-temperature condensate is substandard, the low-temperature condensate outlet of the water quality testing device will discharge the low-temperature condensate. When the water quality of the low-temperature condensate is qualified, the low-temperature return water outlet of the water quality testing device inputs the low-temperature condensate into the inlet of the first bypass valve. The second temperature sensor is connected to the second condensate outlet of the steam heating section and is used to detect the temperature of the high-temperature condensate generated by the steam heating section to obtain the condensate temperature value. The control module is used to acquire the condensate temperature value, and when the condensate temperature value is higher than the first condensate temperature threshold, it controls the first bypass valve to open, so that the high-temperature condensate generated by the steam heating section mixes with the low-temperature condensate.

6. The air conditioning system according to claim 5, characterized in that, It also includes a third temperature sensor and a temperature regulating valve; the third temperature sensor and the temperature regulating valve are respectively connected to the control module; The third temperature sensor is connected to the high-temperature condensate inlet of the surface cooler section and is used to detect the temperature of the high-temperature mixed condensate to obtain the condensate inlet temperature value. The inlet of the temperature regulating valve is connected to the low-temperature return water outlet of the water quality detection device, and the outlet of the temperature regulating valve is connected to the high-temperature condensate inlet of the surface cooler section. The control module is used to acquire the condensate inlet temperature value and control the opening of the temperature regulating valve according to the condensate inlet temperature value, so that the low-temperature condensate and the high-temperature mixed condensate are mixed.

7. The air conditioning system according to claim 6, characterized in that, It also includes a fourth temperature sensor and a fifth temperature sensor; the fourth temperature sensor and the fifth temperature sensor are respectively connected to the control module; The fourth temperature sensor is connected to the low-temperature condensate outlet of the surface cooler section and is used to detect the low-temperature condensate temperature at the low-temperature condensate outlet and obtain the low-temperature condensate temperature value. The fifth temperature sensor is located on the surface of the surface cooler section and is used to detect the temperature of the surface of the surface cooler section and obtain the surface temperature value. The control module is used to acquire the low-temperature condensate temperature value and the surface temperature value, and when the low-temperature condensate temperature value is less than the first antifreeze temperature threshold or the surface temperature value is less than the second antifreeze temperature threshold, it controls the condensate pump to increase its speed and controls the first bypass valve and the temperature regulating valve to close.

8. The air conditioning system according to claim 1, characterized in that, It also includes a coarse filter, a first pressure sensor, a second pressure sensor, and a second bypass valve; the first pressure sensor, the second pressure sensor, and the second bypass valve are respectively connected to the control module; The coarse filter is located between the outlet of the first mixer and the inlet of the high-temperature condensate in the surface cooler section, and is used to filter the high-temperature mixed condensate. The first pressure sensor is connected to the inlet of the coarse filter and is used to detect the water flow pressure at the inlet of the coarse filter to obtain a first water flow pressure value. The second pressure sensor is connected to the outlet of the coarse filter and is used to detect the water flow pressure at the outlet of the coarse filter to obtain a second water flow pressure value. The second bypass valve is located between the outlet of the first mixer and the high-temperature condensate inlet of the surface cooler section; The control module is used to acquire the first water flow pressure value and the second water flow pressure value, and when the difference between the first water flow pressure value and the second water flow pressure value is greater than the first differential pressure threshold, it controls the second bypass valve to open, so that the high-temperature mixed condensate flows into the high-temperature condensate inlet of the surface cooler section through the second bypass valve.

9. The air conditioning system according to claim 1, characterized in that, It also includes a display module and a storage module; The control module is used for: Calculate the real-time operating efficiency value of the surface cooler section and store the real-time operating efficiency value in the storage module; Calculate the average efficiency of the real-time working efficiency value in the storage module within a first preset time period; The operating status of the surface cooler section is determined based on the real-time working efficiency value and the average efficiency value. Based on the operating status, the display module is controlled to display preset operation reminders.

10. A control method for an air conditioning system, characterized in that, The control method is implemented using the air conditioning system according to any one of claims 1-9, and includes: The flow rate of the high-temperature mixed condensate is adjusted by controlling the condensate pump according to the heat load requirement of the air to be heated; The outdoor temperature value is obtained, and based on the outdoor temperature value, the two steam valves are controlled to adjust the flow rate of the high-temperature steam input to the preheating section and the steam heating section, respectively.

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